  We study soliton interaction in the Modified Kadomtsev-Petviashvili-(II)
equation (MKP-(II)) using the totally non-negative Grassmannian. One constructs
the multi-kink soliton of MKP equation using the $\tau$-function and the
Binet-Cauchy formula, and then investigates the interaction between kink
solitons and line solitons. Especially, Y-type kink-soliton resonance, O-type
kink soliton and P-type kink soliton of X-shape are investigated. Their
amplitudes of interaction are computed after choosing appropriate phases.
