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In terms of the Fourier-Haar coefficients, a criterion is obtained for thefunction $f (x_1,x_2)$ to belong to the net space $N_{\bar{p},\bar{q}}(M)$ andto the Lebesgue space $L_{\bar{p}}[0,1]^2$ with mixed metric, where$1<\bar{p}<\infty$, $0<\bar{q}\leq\infty$, $\bar{p}=(p_1,p_2)$,$\bar{q}=(q_1,q_2)$, $M$ is the set of all rectangles in $\mathbb{R}^2$. Weproved the Hardy-Littlewood theorem for multiple Fourier-Haar series.

The Hardy-Littlewood theorem for double Fourier-Haar series from  Lebesgue spaces $L_{\bar{p}}[0,1]$ with mixed metric and from net spaces  $N_{\bar{p}, \bar{q}}(M)$