Abstract: A method of adjusting coating weight of a coating material with high accuracy within a wide range of operation, by setting and using a relational formula for determining a coating weight W of the coating material separately in accordance with relative relation between a nozzle-strip distance D and a nozzle slit clearance B. The adjustment of the coating weight of molten metal (coating material) is performed by controlling a nozzle pressure P and a strip speed V, and also by controlling D by equation (1) in the range of D/B.ltoreq.C (developing range) and at least one of D and B by equation (2) in the range of D/B>C (fully developed range). (.rho..sub.M =molten metal density, .mu.=molten metal viscosity, P.sub.A =pressure at nozzle outlet, .eta.=nozzle efficiency, K=ratio of specific heat of gas, and h.sub.1 and h.sub.2 =constants)W=h.sub.1 .times..rho..sub.M .times.{(K-1)/(2.times..eta..times.K.times.P.sub.A)}.sup.1/2 .times.D.sup.1/2 .times.[.mu..times.V/{(P/P.sub.A).sup.(K-1)/K -1}].sup.1/2(1)W=h.sub.2 .