1. This paper refers to isocyclic acrylonitrile xadiazol and its derivatives which can be used as fungicides. 1. Claim 1: a compound or a salt of formula (1), wherein X1 represents n or CR1；X2 represents n or CRU；X3 is n or CR3；Xs.830808 stands for N or cr.830808；Where R1,r2，R3 and r830808；(a) In the presence of, it independently represents hydrogen, halogen or c8318331c8332323a tar； c833099a represents cf832323ao cf83222cl； CZ represents arilo, which is different from c83323833121iz； c83320a represents isopropyl or isocyclopropyl of 3 to 10 members, different from arilo, c8323833121； c83320a represents isopropyl or isopropyl of 3 to 10 members or isopropyl group of 3 to 10 members； a. One or more substitutes selected from sf8325a which may be the same or different are substituted by sf832525；a. The results showed that the optimum conditions were as follows: halogen, cyanide, cyanogen, hydrogen Xi, amino, nitro, c8321； e. c832627 alcoxi, c832131； C832183318C8326A1-C（=O）-NH-，(c) Count down 8321； 8320； - carbon, c8332323232383833331318321838331s s s-832622323238383833183838383232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232323232321212121212121212121；；；；；；；； · · · · · · · · ·, for example, phenyl,a. Aril-c832183318331-832626 - tar and non tar, where one or more alternatives can be selected, which can be equal or different. These alternatives are selected from the halogen group, c832183383326aque tar, c8321833183326avi, c83218331833131c8383838332 hydrogen alcox and c831832183318aque； a. 1. Asphalt, (= O) - o-cc2213131 ° - 832626 asphalt, c83218c8333131； C8332383312183208cbocyl，C8322383318c83218320cbocyl，a. Isopropene, arilo (phenyl) or isopropene of 3 to 10 members may be replaced by
