Sixteen new compounds of the type Ph₃SnX were prepared, using two different methods, and their fungicidal properties, together with those of some other known tompounds of the same type, were tested on Aspergillus niger, PeniciLlium italicum, Xanthomonas malvacearum and Sclerotinia sclerotionum.From the results obtained (as indicated in Tables 2 and 3)，we may conclude that the variation of the group X in Ph₃SnX (cf.Table 1) does affect the fungicidal activity concerned, the effect may be quite markedly in certain cases.