v3.22.2.2
Summary of significant accounting policies (Tables)
12 Months Ended
Mar. 31, 2022
Accounting Policies [Abstract]  
Schedule of consolidated financial statements
                     
Name  Place of incorporation  Date of incorporation   Business engaged in  Effective ownership as of March 31 2022   Effective ownership as of March 31, 2021 
ZY Holdings  Cayman Islands   July 5, 2016   Investment holding   100%    100% 
China Bio  Republic of Seychelles   June 27, 2016   Investment holding   100%    100% 
ZY HK  Hong Kong   June 13, 2016   Investment holding   10.0%    100% 
ZY Shenzhen  PRC   June 10, 2014   Investment holding   100%    100% 
BF Beijing  PRC   August 30, 2012   Nervonic acid research, development of nervonic acid based herbal and chemical drugs and the sales of health supplements continuing nervonic acid   100%    100% 
Dandong BF  PRC   March 11, 2019   Research, development and growing of Acer truncatum seedlings   100%    100% 
Schedule of exchange rates
          
    2022    2021 
Balance sheet items, except for equity accounts   

RMB1=$0.1577

HK$1=$0.1277

    

RMB1=$0.1526

HK$1=$0.1286

 
Items in statements of income and cash flows   

RMB1=$0.1558

HK$1=$0.1284

    

RMB1=$0.1475

HK$1=$0.1290

 
Schedule of estimated useful lives
   
    Useful Life
Office equipment, fixtures and furniture  3-5 years
Computer equipment  3-5 years
Schedule of reconciliation of basic and diluted loss per share
              
   2022   2021 
Net loss    $1,125,565     $28,022 
               
Weighted average number of ordinary shares outstanding              
- basic and diluted     17,283,258      17,145,000 
               
Net loss per share              
- basic and diluted    $6.51 cents     $0.16 cents