Viscocanalostomy is used as the surgical intervention for open angle glaucoma. It has advantage of creating gradual filtration through the thin trabeculo-descemet membrane to reduce markedly the postoperative complications. Lately, many surgeons modified VCO, like combined it with phacoemulsification, or use the implant. Many to lower IOP to a greater degree and enhance success rates. This article reviewed the history of VCO, specially on the point of the surgical methods, effect, development, progress and tendency of VCO.