The crystal structure, magnetic transition point and saturation magnetic moment were determined for (Fe1-xMx)3P compounds with M=Cr, Mn, Co, Ni. X-ray examination identified all the compounds as b.c.t., except Mn compounds with 0.30.3 could not be prepared. Antiferromagnetism was found in Mn compounds with x>0.3. The concentration dependence of lattice constants indicates that, in the range of small x, the substitution occurs preferentially at a specified site. The saturation moment at 4.2 K decreases almost linearly with increasing x, but with a different slope depending on the substituted elements. The result was discussed based on the assumption of the preferential substitution.

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