The length is about 14cm. The head and neck is bluish-black, the cheek is white. The under surface is also white. This birds is distinguished from other species of great tit because they have thich, black stripe which is tie-shape. Males have thicker stripe that is connected to the top of the legs. The back is gray. They are common in flatland, forest, mountain, garden which has the trees, city park and around the houses.
They nest in april to july and lay 6 to 12 eggs. Especially they like artificial box for bird, so if the box is suitable, they nest and raise their young in the garden. They mostly eat insects, grass or seed of trees in autumn to winter. After breeding season, they group with marsh tit, coal tit, long-tailed tit together.