First, the yin and yang, yin and yang corner wall moldings practice first batch layer of ash at the grassroots level, and then playing the line, so playing the line to see clearly point. Clean gray knife Yang angle and the surrounding bumps. Not clean, then playing the line will encounter obstacles, is not playing. Two, two, yin and yang angle elastic cord. In every corner of yin and yang with vertical lines vertical lines placed bombs fall line treatment, and yin and yang angle vertical line as a reference to 500mm were placed on both sides of a vertical line parallel to the yin and yang angle parallel lines, this line is defined as the "yin and yang angle standard line." Wall putty with plaster on the front sides of the yin and yang within 500mm angle for leveling, leveling with two meters by foot to the vertical direction is detected as the standard error is less than 2mm. Yang angle to 500mm outside both sides with plaster or putty find Junpei. 3, along with putty putty brush ink line straight to the corner, to be dry, open the full gray, with two meters by foot L-shaped aluminum one pull one, from one side parallel to the Yin Yin corner angle, when pushed to the corner gently twitching back and forth parallel scraped look after, overcast angle so as not to deal with a small bend. After dry, check Yang angle is qualified, according to the vertical line inspection yin and yang corner wall flatness error within 5mm wall lining with leveling, error than 5mm must be leveled with plaster. 4, Yang Yang angle corner handle anti-bump protruding because it is relatively easy to be hit, causing damage to the wall or furniture or even injury. To prevent this from happening, you can take measures to prevent the processing of positive angle bump. Alternative approach has the sun angle make smooth handling, use sandpaper to polish into a small arc here; or you can placement Corner bar to be protected.