Business culture in Thailand is formal, and very hierarchical. Business relationships form slowly, and it may take a few meetings to build up the trust needed to complete a business transaction. The culture of respect, politeness, and harmony means that you will often have to read between the lines and pay close attention to non-verbal communication to know what is really being said.
Try to make appointments at least a month in advance. Punctuality is especially important in business settings, so arrive a few minutes early to any appointment or meeting.
Men should wear dark colored business suits. For women, conservative suits, blouses, or business dresses are appropriate.
Business cards are an important part of business etiquette. If you are given a card, accept it with your right hand, look at it for a few seconds, and place it neatly in your wallet.
If you are handing out your business card, offer it to the person with the highest social status first.
Always show respect, humility and good humor, and avoid any displays of negative emotions.