Urea is an excellent nonlinear optical (NLO) medium. However, growth of large high-quality crystals for practical use still remains a challenge due to its unfavorable growth properties. Improved crystalline and optical quality could be expected in mixed systems. This work presents the synthesis, growth and second-harmonic-generation (SHG) studies of two-component new organic NLO systems, urea-meta nitro benzoic acid (mNBA) and urea-L-malic acid. The material property of urea seems to be modified by the addition of mNBA and L-malic acid. The SHG efficiency was measured by Kurtz powder method showing variation with composition variation.