What does it mean to 'develop' your pieces in xiangqi?
These answers restate the rules implemented by our open-source engine, which follows the WXF laws and is regression-tested against the official 110-diagram repetition casebook. Where an answer refers to a specific position, that position lives on the linked reference page, where the build verifies it against the engine before publishing.
Direct answer
Developing means moving your active pieces, mainly horses, cannons and chariots, off their starting squares and onto squares where they actually influence the game, rather than leaving them sitting at the back doing nothing. A beginner told to "develop" is being told to stop pushing the same soldier repeatedly and start bringing more pieces into the game.
What counts as a developing move
Moving a horse out to a central square, swinging a cannon onto a file it can use, or opening a path for a chariot are all developing moves. Moving the same piece back and forth, or pushing a soldier that does not threaten anything, generally is not, even though it is technically a legal move that changes the position.
Why beginners are told to prioritise it
A single strong piece cannot do much alone against a full army, and a player who has developed three or four pieces before their opponent has developed any is usually already winning the middlegame before real fighting even starts. This is the same underlying idea covered in more depth at opening principles.
Related questions
Should I develop every piece before attacking?
Not rigidly, but having most of your pieces in play before committing to an attack is a good general habit while learning.
Do advisors and elephants need developing too?
Not in the same sense, since they mostly stay near the palace for defence rather than actively manoeuvring around the board.