https://cas.cn
SEO
· 7 checks — Canonical, meta, content depth, internal links, image SEO, and hreflang rolled into one auditable list.SCORE
88
GRADE
B
FIX
0
REVIEW
2
PASS
4
INFO
1
Cross-tab audit — SEO, performance, crawlability, mobile, structured data
Checks
74 PASS 2 REVIEW
BCanonical URLMinor issuesREVIEW
Canonical URL
Minor issues
Minor issues
Warning::
No canonical tag found
Search engines will determine the canonical URL themselves, which may cause duplicate content issues.
No Canonical URL Set
Page URL https://cas.cn Canonical (not set)
Search engines will determine the canonical URL themselves, which may cause duplicate content issues.
Why this matters
Without a canonical, Google may treat each URL variant (with/without slash, with tracking params, http/https) as duplicate content and split ranking.
Learn more ▾ ▴
A canonical link tells Google which URL is the 'real' one when multiple URLs serve identical content. Without it, link equity gets split across variants and none of them rank as well as a single canonical version would. One <link rel="canonical"> tag in <head> covers it.
Source: Google Search Central
BContent Depth668 words, Very DifficultREVIEW
Content Depth
668 words, Very Difficult
668 words, Very Difficult
Info::
Page has 668 words of content
Info::
Reading level: Very Difficult (grade 257)
Good depth
Reading level
Very Easy
Easy
Fairly Easy
Standard
Fairly Difficult
Difficult
Very Difficult
Grade 257
Text-to-HTML Ratio
11% text 89% HTML
18 KB / 161 KB
AMeta TagsTitle: 15 charsPASS
Meta Tags
Title: 15 chars
Title: 15 chars
Info::
Page title is set
Got: 中国科学院
Warning::
Title is only 15 characters — consider expanding
Title
"中国科学院"
15 characters Too short
Robots: Indexable (no restrictions)
A+Internal Links144 internal, 300 externalPASS
Internal Links
144 internal, 300 external
144 internal, 300 external
Info::
144 internal links (32%)
Info::
89% of links use descriptive anchor text
Info::
Page has 444 links — consider reducing
Info::
144 internal / 300 external links
Link Distribution
32% internal (144) 68% external (300)
Anchor Text Quality
396 Descriptive 48 Empty
Most Linked Internal Pages
| # | URL | Links |
|---|---|---|
| 1 | javascript:void(0); | 22 |
| 2 | # | 4 |
| 3 | ./newmedia/dsp/ | 3 |
| 4 | ./yw/ | 3 |
| 5 | ./jl/xfqd/ | 3 |
| 6 | ./xzfc/ | 3 |
| 7 | ./zcjd/ | 3 |
| 8 | ./gj/ | 3 |
| 9 | ./syky/ | 3 |
| 10 | ./jl/wf/ | 3 |
Top External Domains
| Domain | Links |
|---|---|
| www.cas.cn | 215 |
| www.news.cn | 13 |
| www.sciengine.com | 4 |
| www.kepu.net.cn | 3 |
| idea.cas.cn | 3 |
| www.casad.cas.cn | 3 |
| www.ustc.edu.cn | 2 |
| scicn.casad.cas.cn | 2 |
| www.casip.ac.cn | 2 |
| english.cas.cn | 2 |
A+Image SEO123 images, 100 descriptive filenamesPASS
Image SEO
123 images, 100 descriptive filenames
123 images, 100 descriptive filenames
Info::
23 image(s) have hash/generic filenames
Info::
122 image(s) missing alt text — see Accessibility tab
100 descriptive
0 hash-based
23 generic
123 total
| Filename | Quality | Alt | Issues |
|---|---|---|---|
| z19_logo.png | descriptive | ✗ | 1 |
| dsb01_20251217.png | descriptive | ✗ | 1 |
| dsb02_20251217.png | descriptive | ✗ | 1 |
| z19_pc_m.png | descriptive | ✗ | 1 |
| z19_en_m.png | descriptive | ✗ | 1 |
| wza_2024.png | descriptive | ✗ | 1 |
| z19_search_m.png | descriptive | ✗ | 1 |
| z19_close.png | descriptive | ✗ | 1 |
| W020191125383560116474.jpg | generic | ✗ | 2 |
Current: W020191125383560116474.jpg Suggested: 201803.jpg | |||
| W020240407367171999355_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020190929738332637068.jpg | generic | ✗ | 2 |
Current: W020190929738332637068.jpg Suggested: 201704.jpg | |||
| W020201118270525579945.jpg | generic | ✗ | 2 |
Current: W020201118270525579945.jpg Suggested: 201909.jpg | |||
| W020190929739561066807.jpg | generic | ✗ | 2 |
Current: W020190929739561066807.jpg Suggested: 201605.jpg | |||
| W020240329553856002424_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020240912524118761361_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020231122659760924736.jpg | generic | ✗ | 2 |
Current: W020231122659760924736.jpg Suggested: 202311.jpg | |||
| W020250406365313605807_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020250406366075798999_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020250416559005659783_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020251218541107090958_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020251218633030399800.jpg | generic | ✗ | 2 |
Current: W020251218633030399800.jpg Suggested: 202512.jpg | |||
| z19_kxyj_img2.jpg | descriptive | ✗ | 1 |
| 20260309_navkjqk.png | descriptive | ✗ | 1 |
| 20220826kejitop.jpg | descriptive | ✗ | 1 |
| P020190929620050824644.jpg | generic | ✗ | 2 |
Current: P020190929620050824644.jpg Suggested: images.jpg | |||
| z19_school1.jpg | descriptive | ✗ | 1 |
| z19_school2.jpg | descriptive | ✗ | 1 |
| z19_school3.jpg | descriptive | ✗ | 1 |
| z19_school_bar1.jpg | descriptive | ✗ | 1 |
| z19_school_bar2.jpg | descriptive | ✗ | 1 |
| z19_school_bar3.jpg | descriptive | ✗ | 1 |
| W020240510574946875857_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020240510575174145626_ORIGIN.jpg | descriptive | ✗ | 1 |
| z2025_dqgz1.jpg | descriptive | ✗ | 1 |
| z19_dqgz2.jpg | descriptive | ✗ | 1 |
| W020260121576547305038_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260121572218060263_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260304562615519478_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260304562615738276_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260320367237873144_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260320373519199299_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260303457407403045_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260303457407615596_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260305339535003381_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260305339535231140_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260128305083603703_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260128305083857947_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260121576547305038_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260121572218060263_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260304562615519478_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260304562615738276_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020231229530488598921_ORIGIN.jpg | descriptive | ✗ | 1 |
| z19_index_yw1.png | descriptive | ✗ | 1 |
| z19_index_yw2.png | descriptive | ✗ | 1 |
| W020260421522038092312.png | generic | ✗ | 2 |
Current: W020260421522038092312.png Suggested: 202604.png | |||
| W020260414668107692283_ORIGIN.jpg | descriptive | ✗ | 1 |
| z19_index_ky1.png | descriptive | ✗ | 1 |
| z19_index_ky2.png | descriptive | ✗ | 1 |
| W020260421315832007785_ORIGIN.jpg | descriptive | ✗ | 1 |
| W020260421385309959198.png | generic | ✗ | 2 |
Current: W020260421385309959198.png Suggested: 202604.png | |||
| z19_index_gz1.png | descriptive | ✗ | 1 |
| z19_index_gz2.png | descriptive | ✗ | 1 |
| W020260416563069960778.png | generic | ✗ | 2 |
Current: W020260416563069960778.png Suggested: 202604.png | |||
| W020260324417741201243.png | generic | ✗ | 2 |
Current: W020260324417741201243.png Suggested: 202603.png | |||
| z19_index_zt1.png | descriptive | ✗ | 1 |
| W020260401410085460301.jpg | generic | ✗ | 2 |
Current: W020260401410085460301.jpg Suggested: 202604.jpg | |||
| W020260401410081532588.jpg | generic | ✗ | 2 |
Current: W020260401410081532588.jpg Suggested: 202604.jpg | |||
| W020260320378579484579.jpg | generic | ✗ | 2 |
Current: W020260320378579484579.jpg Suggested: 202603.jpg | |||
| z19_jl_img.png | descriptive | ✗ | 1 |
| W020231229530488598921_ORIGIN.jpg | descriptive | ✗ | 1 |
| zjzkypc_202303.jpg | descriptive | ✗ | 1 |
| zjzkymob_202303.jpg | descriptive | ✗ | 1 |
| zjxbpc_202303.jpg | descriptive | ✗ | 1 |
| zjxbmob_202303.jpg | descriptive | ✗ | 1 |
| zkyzsmob_202303.jpg | descriptive | ✗ | 1 |
| z19_index_tz1.png | descriptive | ✗ | 1 |
| z19_index_tz2.png | descriptive | ✗ | 1 |
| z19_index_video1.png | descriptive | ✗ | 1 |
| z19_index_video2.png | descriptive | ✗ | 1 |
| W020260420379180266731_ORIGIN.jpg | descriptive | ✗ | 1 |
| z19_video_play.png | descriptive | ✗ | 1 |
| W020260418314827276324_ORIGIN.jpg | descriptive | ✗ | 1 |
| z19_video_play.png | descriptive | ✗ | 1 |
| W020260417530461254188_ORIGIN.jpg | descriptive | ✗ | 1 |
| z19_video_play.png | descriptive | ✗ | 1 |
| W020260421276040437486.jpg | generic | ✗ | 2 |
Current: W020260421276040437486.jpg Suggested: 202604.jpg | |||
| z19_video_play.png | descriptive | ✗ | 1 |
| W020260420329652831168.png | generic | ✗ | 2 |
Current: W020260420329652831168.png Suggested: 202604.png | |||
| z19_video_play.png | descriptive | ✗ | 1 |
| W020260421546988627746.png | generic | ✗ | 2 |
Current: W020260421546988627746.png Suggested: 202604.png | |||
| z19_video_play.png | descriptive | ✗ | 1 |
| z19_index_xk2.png | descriptive | ✗ | 1 |
| z19_index_xk1.png | descriptive | ✗ | 1 |
| z19_index_ft1.png | descriptive | ✗ | 1 |
| z19_index_ft2.png | descriptive | ✗ | 1 |
| z19_index_zt1.png | descriptive | ✗ | 1 |
| W020260401410085460301.jpg | generic | ✗ | 2 |
Current: W020260401410085460301.jpg Suggested: 202604.jpg | |||
| W020260401410081532588.jpg | generic | ✗ | 2 |
Current: W020260401410081532588.jpg Suggested: 202604.jpg | |||
| W020260320378579484579.jpg | generic | ✗ | 2 |
Current: W020260320378579484579.jpg Suggested: 202603.jpg | |||
| z19_jl_img.png | descriptive | ✗ | 1 |
| z19_index_zt1.png | descriptive | ✗ | 1 |
| W020260401410085460301.jpg | generic | ✗ | 2 |
Current: W020260401410085460301.jpg Suggested: 202604.jpg | |||
| W020260401410081532588.jpg | generic | ✗ | 2 |
Current: W020260401410081532588.jpg Suggested: 202604.jpg | |||
| W020260320378579484579.jpg | generic | ✗ | 2 |
Current: W020260320378579484579.jpg Suggested: 202603.jpg | |||
| z19_jl_img.png | descriptive | ✗ | 1 |
| z19_jl_icon2.png | descriptive | ✗ | 1 |
| z19_jl_icon4.png | descriptive | ✗ | 1 |
| z19_jl_icon5.png | descriptive | ✗ | 1 |
| z22_jl_xfqd.png | descriptive | ✗ | 1 |
| z19_index_tj.png | descriptive | ✗ | 1 |
| z19_tj_img3.jpg | descriptive | ✗ | 1 |
| z19_tj_img1.jpg | descriptive | ✗ | 1 |
| yjzxgl_202203826.jpg | descriptive | ✗ | 1 |
| z19_scroll_wb.png | descriptive | ✗ | 1 |
| z19_scroll_wx.png | descriptive | ✗ | 1 |
| z19_ewm3.jpg | descriptive | ✗ | 1 |
| z19_scroll_top.png | descriptive | ✗ | 1 |
| z19_return_m.png | descriptive | ✗ | 1 |
| foot_jgawb.png | descriptive | ✗ | 1 |
| jiucuo.png | descriptive | ✗ | 1 |
| blue.png | descriptive | ✗ | 1 |
| z19_gopc.png | descriptive | ✗ | 1 |
See Accessibility tab for detailed alt text quality analysis.
A+Schema Markup AuditPer-type completeness vs Schema.org requirements + rich-result eligibilityPASS
Schema Markup Audit
Per-type completeness vs Schema.org requirements + rich-result eligibility
No structured data detected
Without JSON-LD or microdata, this page can't qualify for any of Google's rich result formats. Even basic Organization or WebSite schema is a quick win.
Hreflang0 hreflang tagsINFO
Hreflang
0 hreflang tags
0 hreflang tags
No hreflang tags detected.
Hreflang tags are only needed for multilingual or multi-regional sites.
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.