In this study，NK-10，SC12 and SC9 were used as test materials，and 4 exogenous calcium treatments [0 kg/hm²(CK)，20 kg/hm²(T1)，40 kg/hm²(T2)and 60 kg/hm²(T3)] were set up to study the effects of exogenous calcium on the yield and quality of edible cassava.The results showed that with the increase of exogenous calcium application amount，the yield，potato length，potato thickness and starch of edible cassava increased first and then decreased，the calcium，protein and crude fiber of root tuber increased gradually，while the production of physiologically deteriorated(PPD) production decreased gradually.The yield and potato diameter under T1 and T2 treatments，potato length under T1 treatment，calcium and protein contents under T2 and T3 treatments，starch content under T1，T2 and T3 treatments were significantly higher than the CK，while the PPD production under T2 and T3 treatments was significantly less than the CK. The results of regression analysis showed that when the application amount of exogenous calcium was 33 kg/hm²，the yield of edible cassava reached the maximum.It can be concluded that exogenous calcium in a certain range can improve the root length，root diameter，yield，starch and protein of edible cassava，and it also plays an important role in improving the storage capacity of cassava.The optimal application amount of exogenous calcium is 33 kg/hm².