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The influence of pure La, pure Ce, (La+Ce) mischmetal on the dendritical arm space(LDAS) of ZL105 alloy in cylinderical casting was studied. The effects of adding amount of (La+Ce) mischmetal on LDAS and ultimate tensile strength(σb) were investigated, and the relationship between σb and LDAS was founded. (La+Ce) mischmetal has stronger ability to refine LDAS than pure La or pure Ce. The proper adding amounts of it is 0.15%(mass fraction). LDAS has a remarkable effect on σb of casting, which can be predicted by the regression equation obtained in this work.