As　we　all　known　that　laser-phased-array　system　can　provide　an　excellent　means　for　achieving　random　beam　steering.　In　this　paper　the　crystal　of　the　Lithium　Niobate　(LiNbO3)　will　be　used　as　the　phase　shifter　to　change　the　phase.　According　to　the　parameter　of　LiNbO3　the　relationship　is　presented　between　the　control　voltage　that　loaded　on　LiNbO3　and　phase　modulation.　Then,　on　the　basis　of　the　far　field　coherent　combination,　the　relationship　between　the　control　voltage　and　the　steering　angle　of　the　laser　beam　will　be　obtained.　The　numerical　results　are　presented　and　have　verified　the　theoretical　analysis.