In　this　paper,　synthesis　of　YOV4　birefringence　crystal　raw　material　in　liquid　phase　was　studied.　Mostly,　the　effects　of　solution＇s　pH　values　and　some　other　synthesis　conditions　on　purity　and　whiteness　were　discussed.　Infra-red　spectrometry,　X-ray　powder　diffraction　and　UV　spectrometry　were　used　in　the　characterization　of　the　raw　material　and　single　crystal,　and　in　this　way　the　best　method　of　synthesis　was　defined.　The　result　of　the　study　indicates　that　the　purity　of　the　raw　material　had　decisive　effect　on　the　crystal　growth.　Flawless　crystal　with　the　dimensions　of　phi40　x　40　x　50　mm(3)　was　grown　by　Czochralski　(CZ)　technique.