This report discusses on the dew water collection by condenser in Gulf region based on weather condition and water condition of Gulf region. Best weather condition and optimal condenser size are firstly determined. The maximum water production rate 4.879kg/s can be reached under a certain weather condition with RH=90%, v=8. And the optimal condenser size that requires the least pumping power is determined to be D=1m, U=1.6, N=50 and S=1800. Yearly fresh water production can be satisfied in Gulf region.