Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cost of revenues (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cost of revenues (Details) - CNY (¥)
9 Months Ended 12 Months Ended
Dec. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Cost of revenues      
Test monitoring costs ¥ 191,809,319 ¥ 163,061,810 ¥ 142,116,286
Royalty fees ¥ 7,406,065 ¥ 7,423,118 ¥ 4,823,101