Article in English: Sometimes, breeding pairs spawn only days after being transferred to the spawning tank. In other cases, it can take several weeks of waiting and a little bit of prodding for them to feel comfortable enough to produce fry. Here are some things you can do to encourage breeding:  Raise the temperature a few degrees if it's currently under 80 °F (27 °C). Do a 75% water change, being careful to condition the water and make sure the pH and softness of the water is close to what the angels are accustomed to. Feed them a bit more than usual with high-quality freeze dried food. Give them more security by adding additional plants, spawning mops, or other fibrous, decontaminated props. Try a larger aquarium if your tank is at or below the 20 gallon (75.7 L) mark. Place another angelfish or another breeding pair close to, but still separate from, their aquarium. Sometimes, the sight of another angelfish will get them breeding. If you've waited in vain for your breeding pair to do the deed, and you've tried all of the above suggestions, it may be time to play matchmaker again. There's a good chance the breeding pair isn't actually compatible, and you'll want to find a different mate for each fish. Try placing them back into a bigger aquarium and wait for them to pair off with other mates. Angelfish normally care for their own spawn so leave them to it once they have spawned and disturb them as little as possible. Any form of undue stress or unexpected routine can cause the angelfish to start to eat their own fry.  As the breeding pair raises their fry, continue feeding the breeding pair as before, taking note that they may not be as hungry. Remove any unwanted or uneaten food immediately after feeding and take pains to ensure the water quality is high and uncontaminated. Occasionally you get a pair of angels that eat their fry. When this happens, you have no alternative but to remove the cone or slate with the eggs to another tank containing identical water and raise them artificially. Transfer the fry to a clean 1 gallon...

Summary in Chinese:
等配好对的天使鱼产卵。 如果上面这些都失败了，那么你需要把天使鱼重新配对。 如果可以的话，让天使鱼自己孵卵。 如果需要的话，人工孵卵。 在27摄氏度的水里，大约过60小时卵就会孵化。