Mandel Q pa ra meter and output noise spectrum of multiphoton lasers are calculated via Scully -Lamb theory.It is shown that the muliphoton lasers may exhibit intracavity squ eezing with Mandel Q parameter of Q=- 1/2,which is the same for the one-photon laser and whic h corresponds to 50 % intracavity squeezing.However,output noise spectrum is k/(k+1) for k photon laser,which increases with growing k and which indicates that only 50 %,33 %,25 % and 20 % output squeezings are achieved for one-,two-,three- and four- photon lasers,respectively.